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UNITED STATES PATENT OFFICE.

DAVID C. LYALL, 0F NEW YORK, N. Y.

SUPPORTING WINDOW-SASH.

Specification of Letters Patent No. 27,816, dated April 10, 1860.

To all whom 'it may concern:

Be it known that I, DAVID C. LYALL, of New York city, county, and State, have invented certain novel and useful Improvements in the Mode of Hoisting or Lowering VVindow-Sashes; and I hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the characters of reference marked thereon, which characters constitute and form a part of the specification.

To enable the public to fully understand the nature of my invention and those skilled in the mechanic arts to construct and operate the same I will describe it as follows.

Description: Figure l, is a perspective drawing of a window frame and sash having a orticn of the casing removed from the leflt) hand side of the window in order to show the mode of operating the tripletcrank, lock, or catch (c, o, c,) which is show)n more clearly at Fig. 3, letters (c, o, c

Fig. 2 is a vertical sectional drawing of a window frame and sash (a, a,) showing the mode of operating the sash by means of a series of cog-wheels consisting of two or more sets and each set containing two cogwheels arranged at or near the top of the lower sash (a,) on each side of the window, in such a manner that the four wheels (l, 2, 3, 4,) are constantly in gear with the female cogged bars (5, 6,) which are secured to, and form a part of the sides of the sash, hence any action of the cog-wheels causes the sashes (a, a,) to move. Letter (8,) is a slit or opening in the axis-supporting plates (a, m) for the purpose of allowing the cog-wheels to be pressed back, in order to allow the sash to be removed from the frame if required.

Fig. 3, is an exhibit of the triplet crank (c, o, c,) in the act of locking the cogwheels at any desired point by a single action, thereby locking or holding both the upper and lower sash at the same time. by the use of one and the same lock; the crank or handle (o,) may be dispensed with if required and a knob employed in lieu thereof on the inside of the casing as at (10,) but the arrangement as shown in the drawings is much better adapted where inside shutters are used.

Fig. l is a perspective drawing of the cogwheel, and its axis supporting plates (n, m)

a portion of the latter being removed in 0rderuto show more clearly the arrangement and action of the lever (m,)' which is employed to hold the cogged wheel in gear with the cogged bar on the sides of the sash as shown at Fig. 2. This Alever is held firmly against the axis aforesaid by means of the flat spring (10,) which is strongly fas tened at one end thereof, to the face plate, next the sash, as shown at (e.) A wound spring may be employed to assist the cogged gearing in its functions, butother well known devices may be equally well adapted in lieu of the wound spring.

I am fully aware of Sumner Coopers patent window sash supporter of 1859, and I am also aware that Mr. Coopers patent embodies a portion of the individual parts employed by me, but his arrangement is altogether dilferent from mine inasmuch as my series of cog-wheels are placed two abreast on each side of the window and on a horizontal line with each other about one-half the height of the frame (6,) so as to catch and carry either the upper or lower sash to its extreme upward or downward movement without getting out of gear. This is not the case with any other cogged apparatus now in use, from the fact that an arrangement of two cog-wheels placed one above the other, on the same side of the window cannot be made to operate or carry the top of the upper sash down on a horizontal line with or below the top of the lower sash as is. the case with my improved arrangement; it is also well known by mechanics that in case the window should be very wide and the sash very narrow (in height) that a one sided cog-gear would be of little use employed to operate a window sash, inasmuch as the sash would soon become out of plum and unfit for use, but by my arrangement the sash is moved up or down always having a uniform, easy, and equal bearing on the opposite sides of the sash; and by the use of my spring ('v,) and lever (m,) I am enabled to produce a uniform pressure upon the sides of the sashV independent of any wearing of the axis-supporting plates as well as remove the sash if required for cleaning purposes by simply pressing the movable cog-wheel out of gear by means of any thin tool that can be slipped between the sash (0,) and the frame.

I do not claim to have invented a cogged or ratchet gear combined with the use of a Wound flat spring arranged one above the other, and on one side only of a Window for the purpose of opening or closing the same; neither do I claim locking or holding the sash at any J'iXed point by means of a straight Wire, or rod, as that is in common use.

Therefore what I claim as noveland desire to secure by Letters Patent of the United 10 States is- The arrangement and use of the lever or bar (m) slitted bearings (8,.s,) on both sides DAVID C. LYALL.

Witnesses:

PETER BUCHANAN, JAMES P. MGLEAN. 

